Other than the 500+ rounds filled with sarin and mustard, they were either destroyed without the required supervision, moved, or hidden.

If you believe Iraq had nothing to do with terrorism before the invasion than you are either ignorant or naive. In addition to the bounty payments of $25,000 for Palestinian suicide bombers, Iraq provided safe haven for such notable terrorists as Abu Nidal, Abu Abbas, Abdul Rahman Yasin, and lets's not forget Abu Musab al Zarqawi fled to Iraq from Afghanistan before the invasion.

Your assertion that we invented the Taliban and Bin Laden is fiction. The Taliban did not exist until long after the Soviets left Afghanistan and the USSR ceased to exist. Bin Laden was not a member of an American supported faction in the Afghan war against the Soviets, he did not need US money and was attempting to lure others off of US support in return for his financial support.

Compensate them for the damage they did in what the UN determined was an illegitimate act of aggression against a member state. If the other incidents you refer to are similarly adjudicated, we can talk.

1) TERRORISM IN IRAQ:
OK, you're right, there was the support prior to the attacks, however, again, not aimed at us:

What type of terrorist groups did Iraq support under Saddam Hussein’s regime?
Primarily groups that could hurt Saddam’s regional foes. Saddam has aided the Iranian dissident group Mujahedeen-e-Khalq and the Kurdistan Workers’ Party (known by its Turkish initials, PKK), a separatist group fighting the Turkish government. Moreover, Iraq has hosted several Palestinian splinter groups that oppose peace with Israel , including the mercenary Abu Nidal Organization, whose leader, Abu Nidal, was found dead in Baghdad in August 2002. Iraq has also supported the Islamist Hamas movement and reportedly channeled money to the families of Palestinian suicide bombers. A secular dictator, however, Saddam tended to support secular terrorist groups rather than Islamist ones such as al-Qaeda, experts say.

Have U.S.-Iraq relations always been hostile?
No. In the 1980s, following the Iranian revolution and the subsequent hostage crisis in Tehran , the United States saw Saddam as a useful regional counterweight to the Ayatollah Khomeini. Indeed, when Iraq launched a long, brutal war against Iran in 1980, the Reagan administration provided Saddam’s regime with arms, funds, and support.

Does Iraq have ties with al-Qaeda?
The Bush administration insists that hatred of America has driven the two closer together, although many experts say there’s no solid proof of such links and argue that the Islamist al-Qaeda and Saddam’s secular dictatorship would be unlikely allies.

The Islamic "jihad" was supported by the United States and Saudi Arabia with a significant part of the funding generated from the Golden Crescent drug trade:

In March 1985, President Reagan signed National Security Decision Directive 166,...[which] authorize[d] stepped-up covert military aid to the mujahideen, and it made clear that the secret Afghan war had a new goal: to defeat Soviet troops in Afghanistan through covert action and encourage a Soviet withdrawal. The new covert U.S. assistance began with a dramatic increase in arms supplies -- a steady rise to 65,000 tons annually by 1987, ... as well as a "ceaseless stream" of CIA and Pentagon specialists who traveled to the secret headquarters of Pakistan's ISI on the main road near Rawalpindi, Pakistan. There the CIA specialists met with Pakistani intelligence officers to help plan operations for the Afghan rebels.4

"...In the war against Hitler, the United States found common cause with Stalin. In the war against Japan, America aided Vietnamese rebel Ho Chi Minh. In Third World struggles, America helped Manuel Noriega and Saddam Hussein.

As Afghan rebels fought Soviet invaders in the 1980s, the United States gave aid from afar while Saudi exile Osama bin Laden provided support from within Afghanistan.
..."

"WASHINGTON Economic sanctions against Yugoslavia will end and the United States will participate in an international aid program to rebuild the war-torn country if President Slobodan Milosevic permits free and fair elections..."

Milosevic did it, lost the elections, US never helped...

MORE on legimity of the bombing of YU:

March 26, 1999

As of today, President Clinton is now in violation
of the 1973 War Powers Resolution, the one created to
prevent another Vietnam War. He is, in essence,
now using the US military to pursue a purely
personal agenda without the Constitutionally required
approval of Congress. He is the first president
to overtly violate this law since its passage.

26 members of Congress have filed a lawsuit in federal court
today to have the law enforced and the military assault
ended. The 60 day period a president has to use the
military without Congressional approval ended last night
at midnight.